StrToInt

function StrToInt(IntegerString string):Integer;

The StrToInt, it converts a string data (IntegerString) to an integer value.

Example:

var
  firstNumber,secondNumber,result : Integer;

begin

  firstNumber := StrToInt('100');
  secondNumber := StrToInt('200');
  result := firstNumber + secondNumber;

  ShowMessage('Result : '+IntToStr(result));

end;

Output:

Result :  300